vyv_cox
Well-Known Member
There is sufficient potential for 304 and 316 to react galvanically. We use a piece of mesh as a workshop example on the failure diagnosis courses I am involved with. It was made incorrectly, with a 'warp' of 316 and a 'weft' of 304. In seawater service the weft failed quite spectacularly, whereas the warp is in perfect condition.
<<< All probably rather academic as crevice corrosion itself proceeds by a "galvanic" mechanism anyway. The areas in oxygen depleted water water being anodic to the area in oxygen rich water. >>
That's true, but if the metals forming the crevice are identical they will both be corroded. Another example we use is a domestic central heating radiator. The welded joint at the bottom where the two sides come together form a perfect crevice and both sides corrode pretty much equally.
I don't have any information about two 316 stainless steels in which one was at the top of its spec and the other at the bottom. I suggest the OP should contact the manufacturer and try to determine exactly what composition is used for the product. It may even be that this is not the only example they have come across.
<<< All probably rather academic as crevice corrosion itself proceeds by a "galvanic" mechanism anyway. The areas in oxygen depleted water water being anodic to the area in oxygen rich water. >>
That's true, but if the metals forming the crevice are identical they will both be corroded. Another example we use is a domestic central heating radiator. The welded joint at the bottom where the two sides come together form a perfect crevice and both sides corrode pretty much equally.
I don't have any information about two 316 stainless steels in which one was at the top of its spec and the other at the bottom. I suggest the OP should contact the manufacturer and try to determine exactly what composition is used for the product. It may even be that this is not the only example they have come across.
